Question: When did Jean-Jacques Rousseau marry Thérèse Levasseur?
Paraphrase: Jean-Jacques Rousseau married Therese Levasseur on what date?
SPARQL (Wikidata): SELECT ?value WHERE { wd:Q6527 p:P26 ?s . ?s ps:P26 wd:Q440771 . ?s pq:P580 ?value}